Belt cartridge



FIG. 1 is a perspective view of the rear, top and left side of a belt cartridge showing my new design;

FIG. 2 is a perspective view of the front, bottom and left side thereof, at an enlarged scale;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a left side view thereof. 

The ornamental design for a belt cartridge, as shown. 